Watch casing



FIG. 1 is a front elevational view of a watch casing showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a top plan view thereof, the bottom plan view being a mirror image thereto;

FIG. 4 is a right side elevational view thereof; and,

FIG. 5 is a rear elevational view thereof. 

The ornamental design for a watch casing, as shown. 